The Lead Castle Type : LS 241 is designed to shield the plastic scintillator based Beta probe type BSP-2 from background radiation. The shield is of 40 mm thickness and is built up of six interlocking rings. The top and bottom are covered by similar interlocking discs. A door is fitted in the bottom ring with 150 degree opening to facilitate easy access to the sample holding tray of Beta scintillation probe BSP-2. The door is fitted with heavy duty hinges and the inner side of the lead shield is lined with thin aluminium sheet to minimize scattering.